JPH1133262A - Bobbin thread winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the restriction of a winding work position in the tip of a bobbin thread supply means so as to improve the free degree of design and also to enable 100%-winding without permitting a wound thread to come out from a bobbin case opening part. SOLUTION: At the time of winding work, a looper thread guide 40 is abutted on a supplied bobbin thread 14 between the tip 16a of the bobbin thread supply means and a bobbin case 6, the supply route of the bobbin thread 14 is bent by a looper thread guide 40, the insertion angle of the bobbin thread 14 to be supplied into the bobbin case 6 is set to the one by which the outer peripheral part of the wound bobbin thread 14 is not abutted on the bobbin case opening part end 6b and the winding work position N2 of the bobbin thread supply means tip 16a becomes the one by which the whole thread to be wound is uniformly wound-up without permitting the thread to be abutted on the bobbin case opening part end 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lower thread winding device.

[0002]

2. Description of the Related Art In recent years, for example, Japanese Unexamined Patent Publication No. 9-75570 has proposed a bobbin thread winding device which automatically performs a bobbin thread winding operation on a bobbin.

In such a bobbin winding device, as shown in FIG. 9, when the bobbin case 6 containing an empty bobbin is located at the bobbin winding position, the bobbin thread from the bobbin (bobbin supply source) is fed into the bobbin case. The tip 16a of the thread supply nozzle (lower thread supply means) 16 disposed at the initial work position N1 near the bobbin case opening 6a by the lower thread supply moving means (not shown),
At this time, the lower thread required for entanglement is drawn out from the nozzle tip 16a, and air is supplied to the thread supply nozzle 16 to blow out the air from the nozzle tip 16a. Is the bobbin case opening 6a
Is to be guided inside. Further, at this time, the bobbin 13 in the bobbin case is rotated by the bobbin rotating means (not shown) and a vortex is formed in the bobbin case by the air, so that the bobbin thread guided inside the bobbin case is moved by the bobbin shaft 13c. After that, the lower thread supply moving means moves the nozzle tip 16a to the winding operation position N2 separated from the initial operation position N1 to perform lower thread winding, so that so-called uniform winding is performed. I have.

[0004]

However, in the bobbin winding apparatus, in order to perform the above-mentioned uniform winding, the winding operation position N2 must be in contact with the outer diameter of the bobbin maximum winding amount and the end of one bobbin case opening end. 6b and the bobbin shaft 13
c, and must be set within an area J defined by a straight line K connecting the other bobbin case opening end 6c, so that the distance Q between the nozzle tip 16a and the bobbin case opening 6a is predetermined. (Japanese Patent Laid-Open No. 9-7)
No. 5570, 40 mm or more) and the nozzle tip 16
There is a problem that the position of “a” is extremely limited, and the degree of freedom of design is significantly restricted.

In the above bobbin winding device, when the yarn is wound around the bobbin shaft 13c to the vicinity of the maximum winding, if the aligned winding is not formed so cleanly, the portion that is swelled is wound up. (In most cases, the portion corresponding to the approximate center of the bobbin shaft) abuts on one bobbin case opening end 6b, and the yarn is caught in the abutting portion and the wound yarn cannot be advanced in the winding advancing direction (bobbin axial direction). There is also a problem in that the winding is performed in the opposite direction, and this is repeated, so that a one-sided winding occurs, and the wound yarn overflows from the bobbin case opening 6a.

Here, it is conceivable to end the winding at about 80% of the maximum winding in order to solve such a problem, but this is not preferable because the sewing efficiency is reduced.

Accordingly, the present invention can reduce the restriction on the winding operation position of the tip of the lower thread supply means, improve the degree of freedom in design, and achieve 100% winding without the wound thread overflowing from the bobbin case opening. It is an object of the present invention to provide a lower yarn winding device.

[0008]

In order to achieve the above object, a lower thread winding device according to the first aspect of the present invention can draw out a lower thread from a lower thread supply source from its tip and supply it to a bobbin in a bobbin case. A lower thread supply means, an initial work position near the bobbin case opening where the lower thread derived from the lower end is inserted into the bobbin case from an opening in the bobbin case, and the initial work position A bobbin supply moving means movable to a winding operation position for separating the bobbin from the bobbin case and a bobbin in the bobbin case during a winding operation in which a tip of the lower thread supplying means is located at the winding operation position. A bobbin rotating means for rotating the bobbin case, and at the time of the winding operation, a supply path of the bobbin thread is bent by contacting a supplied bobbin between a tip of the bobbin supplying means and the bobbin case. Of bobbin thread supplied to The entry angle, the outer peripheral portion of the lower thread is wound in the bobbin case is characterized in that anda lower thread guide for setting the angle which does not contact the bobbin case opening end.

According to the bobbin winding device according to the first aspect, during the winding operation, the bobbin thread guide abuts on the supplied bobbin between the tip of the bobbin supplying means and the bobbin case,
By the lower thread guide, the lower thread supply path is bent, and the insertion angle of the lower thread supplied into the bobbin case is changed so that the outer peripheral portion of the lower thread wound in the bobbin case is opened in the bobbin case opening. Because it is set at an angle that does not touch the end,
Regardless of whether or not the winding operation position at the leading end of the lower thread supply means is within the above-described region, the wound yarn is uniformly wound to the end without contacting the end of the bobbin case opening.

In order to achieve the above object, a lower thread winding device according to a second aspect of the present invention, in addition to the first aspect, further comprises: a lower thread guide; And a lower thread guide moving means capable of moving to a retreat position separated from the main thread.

According to the bobbin winding device according to the second aspect, the lower bobbin guide is moved by the lower bobbin guide moving means between the working position where the lower bobbin guide comes into contact with the supplied lower bobbin and the retreat position separated from the working position. Therefore, the lower thread guide does not interfere.

In order to achieve the above object, a lower thread winding device according to a third aspect of the present invention comprises a lower thread supply means capable of drawing out a lower thread from a lower thread supply source from a leading end thereof and supplying the lower thread to a bobbin in a bobbin case. The lower end of the lower thread supply means is separated from the initial operation position near the bobbin case opening where the lower thread derived from the lower end is inserted from the opening of the bobbin case into the bobbin case, and the lower thread winding is performed. And a bobbin rotating means for rotating a bobbin in the bobbin case during a winding operation in which a tip of the lower yarn supplying means is located at the winding operation position. According to the winding of the lower thread during the winding operation, the outer end of the lower thread wound in the bobbin case is brought into contact with the end of the bobbin case opening in the bobbin case. Below the movable direction It is characterized by comprising a supply path moving means.

[0013] According to the lower thread winding device of the third aspect, the lower end of the lower thread supply means is moved by the lower thread supply path moving means in accordance with the winding of the lower thread during the winding operation.
Since the outer peripheral portion of the bobbin wound in the bobbin case is moved in a direction that does not contact the end of the bobbin case opening, the winding operation position at the tip of the bobbin supplying means is within the above-described region. Regardless of whether or not the wound yarn is wound, the wound yarn is uniformly wound to the end without abutting the end of the bobbin case opening.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the lower thread automatic supply device according to the present embodiment is attached to a lower portion of a sewing machine bed 10, and includes a lower thread winding device 2 and a remaining yarn removal device 1.
And a bobbin exchanging device 3. The bobbin changing device 3 includes a rotating arm 5 rotatable about the fixed shaft 4 and movable (forward / backward) along the axial direction of the fixed shaft 4 (perpendicular to the paper surface). 5
Bobbin case gripping means capable of gripping or opening the bobbin case 6 at both ends of the bobbin case 6, the lower yarn winding position C of the lower yarn winding device 2, the residual yarn removing position of the residual yarn removing device 1 B, hook position (bobbin case attachment / detachment position)
A.

That is, when it is time to replace the bobbin (insufficient remaining amount of bobbin thread, etc.), the bobbin replacing device 3 advances one of the bobbin case gripping means to the bobbin case attaching / detaching position A, so that the bobbin case The bobbin case gripping means for gripping the bobbin case containing the bobbin wound with the lower thread is opposed to the bobbin case attaching / detaching position A by grasping and taking out, and then retreating and rotating by 180 °, and then the other The bobbin case gripping means is advanced to the bobbin case attaching / detaching position A, so that the bobbin case accommodating the bobbin wound with the bobbin thread is released from the other bobbin case gripping means and transferred to the shuttle 11 and further retracted to a predetermined angle. By performing the rotation, one bobbin case gripping means is moved to the processing operation positions B and C of the respective devices 1 and 2 described above. It has become to so that.

As the bobbin exchanging device 3, for example, one described in Japanese Patent Application Laid-Open No. 9-56948 or the like can be appropriately adopted. In short, the bobbin case gripping means (bobbin case 6) is used as necessary. Any device that can be moved to the case attachment / detachment position A and the processing operation positions B and C of the devices 1 and 2 may be used. Examples of the bobbin case gripping means include, for example, JP-A-5-192476 and JP-A-6-304.
In addition to a pair of electromagnet suction heads described in Japanese Patent Application Laid-Open No. 370/370, appropriate ones such as those using lever claws described in Japanese Patent Application Laid-Open No. 6-304369 can be used. What is necessary is just to be able to attach and detach the case 6 to and from the opposing member (for example, the shuttle 11) as necessary.

When the bobbin case removed from the shuttle 11 with the remaining yarns reduced is gripped by the bobbin case holding means and moved to the remaining yarn removing position B, the bobbin remaining yarn is removed by the remaining yarn removing device 1. . The yarn removing device 1 is configured such that the bobbin is rotated by a yarn pulling-out operation of a pulling-out unit that draws out (hangs) a yarn wound around the bobbin and drawn out from the bobbin case 6 to draw out the yarn wound around the bobbin. Any device may be used as long as it is suitable, for example, a residual yarn removing device disclosed in JP-A-8-3009069.

When the bobbin case containing the bobbin from which the residual yarn has been removed is gripped by the bobbin case gripping means and moves to the lower thread winding position C, the lower thread is wound around the bobbin by the lower thread winding device 2. . The basic configuration of the lower thread winding device 2 is substantially the same as that described in, for example, Japanese Patent Application Laid-Open No. 9-155089, and the lower thread winding device 2 is simplified as shown in FIG. A bobbin rotation means (bobbin driving mechanism) E, a lower thread supply means (air guide mechanism) G, and a thread supply detection mechanism F are provided.

The bobbin rotating means E of the lower thread winding device 2
As shown in FIGS. 2 and 3, by driving the winding motor M1, the rotation driving force is transmitted to the winding clutch plate 12 via the motor shaft pulley 7, the timing belt 8, and the winding pulley 9. At this time, the take-up clutch plate 12 is inserted into the existing hole of the bobbin 13 housed inside the bobbin case 6 held by the bobbin case holding means located at the lower thread winding position C. The clutch claw, which is formed by transmitting the driving force, is connected to the clutch claw to rotate the bobbin 13.

The lower thread supply means G of the lower thread winding device 2 generally includes a thread suction unit 15 and a thread supply nozzle 16 in which a lower thread 14 from a thread winding (lower thread supply source) is disposed, and a solenoid valve. An air source for supplying air to the lower thread supply path in the thread suction device 15 by the opening operation of the nozzle 17 and a nozzle tip 16 by rotating the thread suction device 15 around a shaft 18 as a fulcrum.
and a lower thread supply rotation motor (lower thread supply moving means) M2 for moving the lower thread a to a predetermined position to be described later. The lower thread 14 having a length necessary for entanglement is derived in advance from the nozzle tip 16a. Meanwhile, by driving the lower thread supply rotation motor M2, the nozzle tip 16a is positioned at the initial working position N1 near the bobbin case opening 6a, and at this time, air is supplied to blow out the air from the nozzle tip 16a. The guide yarn is guided from the bobbin case opening 6a to the inside, and at this time, the air is blown into the bobbin case accommodating the bobbin 13 rotated by the drive of the winding motor M1. The lower thread 14 guided inside the bobbin case is entangled with the bobbin shaft 13c (see FIG. 7) by forming a vortex in the bobbin case. The nozzle tip 16a moves to the winding operation position N2 spaced from the initial work position N1 drives the bobbin thread supply rotary motor M2 so as to obtain performed, is configured to perform the lower thread times.

The lower thread supply means G further moves the nozzle tip 16a between the initial operation position N1 and the winding operation position N2 by driving the lower thread supply rotation motor M2 at the time of thread cutting. Then, by performing cutting described later, the lower thread required for entanglement is led out from the nozzle tip 16a.

The yarn supply detecting mechanism F of the lower yarn winding device 2 has a rotatable roller disposed in a lower yarn supply path between the yarn winding and the yarn suction device 15 and having the supply lower yarn 14 wound once. By detecting the rotation of the roller, it is possible to detect the entanglement of the lower thread 14 with the bobbin shaft 13c and the amount of the lower thread wound around the bobbin 13.

The lower thread winding device 2 is connected to the lower thread supply path between the thread winding and the thread suction device 15 by a motor drive as a driving source, as described in, for example, JP-A-8-276089. And a feeding roller capable of feeding the yarn on the yarn winding side to the yarn supply nozzle side is provided, and the lower thread 14 having a length necessary for entanglement is not previously derived from the nozzle tip 16a. The bobbin shaft 13 is fed out by the above-described air.
Of course, it is also possible to replace with a lower thread winding device configured to be wound around with c.

The lower thread winding position 2 is further provided with a thread hooking and thread cutting device. This thread hooking and thread cutting device is provided around the bobbin case 6 located at the lower thread winding position C, for example, similarly to Japanese Patent Application No. Hei 7-150903 filed by the present applicant. The periphery of the bobbin case 6 is rotated by driving a fixed knife fixedly arranged at a predetermined position and a thread separating / rotating motor 41 (a lower thread guide moving means; see FIG. 6) having a moving knife capable of normal rotation and reverse rotation. The apparatus includes a thread handle 40 with a moving knife and a wiper rotatably arranged on the side of the bobbin case 6.

The above-mentioned thread handling with moving knife 40 is disclosed in Japanese Patent Application No.
As in the case of JP-A-150903, it has a configuration in which it is curved in an arc shape centering on the bobbin shaft 13c, and can perform thread hooking and thread cutting.

In particular, in the present embodiment, the above-described yarn handling device 40 with a moving knife is provided with a bobbin case 6 for winding the lower thread.
The insertion angle of the bobbin thread 14 inside the bobbin case is adjusted so that the outer peripheral portion of the bobbin thread 14
(See FIG. 7 and FIG. 9).

That is, the yarn handling 40 with a moving knife is shown in FIG.
As shown in FIG. 5 and FIG. 5, the lower end thereof (sliding contact) comes into contact with the lower thread 14 derived from the bobbin case opening 6a at the time of winding the lower thread at the tip (the left side in FIGS. 4, 5 and 7). A U-shaped lower thread guide notch 40a that can set the insertion angle by bending the supply path is newly provided (the insertion angle setting operation by the lower thread guide notch 40a will be described later). 7, when the bobbin case 6 gripped by the bobbin case gripping means is moved toward the bobbin case open edge 6d (see FIG. 2) by the bobbin exchanging device 2 during threading. A U-shaped notch 40b is provided to guide the bobbin thread (wound bobbin thread) 14 drawn out from the bobbin case opening 6a by moving.

The bobbin thread caught in the cutout portion 40b is then moved by the bobbin exchange device 2 to the bobbin case opposite to the open edge side, so that the bobbin case open edge 6d and the bobbin case open edge side are closed. It is guided to the gap with the bobbin flange, and furthermore, the thread releaser 40 with the moving knife is rotated counterclockwise in FIG. As a result, the bobbin case 6 is moved toward the bobbin case open end edge 6d, thereby being guided into the slit groove. After that, the thread remover 40 with the moving knife is rotated clockwise in FIG. By rotating the bobbin case 6, the lower thread 14 is guided so as to be led out from the lower thread lead-out hole under the lower thread tension spring of the bobbin case 6, so that the thread hooking is completed. To have.

The moving-knife-equipped thread handling unit 40 also has a rear end (the right side in FIGS. 4, 5 and 7) on the side opposite to the open edge of the bobbin case with respect to the vertex of the U-shaped notch 40b. V-shaped notch 40c formed so as to be shifted
And an eyeball (moving knife) 40d for cutting is provided on an extension line along the peripheral surface from the apex of the V-shaped cutout portion 40c on the upper surface thereof. At this time, when the moving-knife thread handling 40 is further rotated clockwise in FIG. 7 from the retracted position, the V-shaped notch 40c is moved from the lower thread guide hole under the lower thread tension spring of the bobbin case 6. The guided lower thread 14 is guided in and captured, and furthermore, the captured lower thread 14 is rotated in a radial direction from the moving female knife threader 40 by the clockwise turning of the moving knife 40 in FIG. It is designed to be cut between the fixed knife and the moving knife 40d which are fixed and arranged outside.

At this time, the bobbin 14 is led out of the lower end of the lower thread tension spring through the lower thread lead-out hole below the lower thread tension spring. The bobbin case 6 and the nozzle tip are adjusted so that the lower thread length up to the point where the moving knife 40d and the fixed knife rub against each other) is the length required for stitch formation by entanglement with the upper thread, that is, about 40 mm. The arrangement of the thread cutting position N5, the fixed knife, the lower thread cutting point, and the like of 6a is determined.

The pivoting operation of the threading device 40 with a moving knife, the moving operation of the bobbin changing device 2 in the axial direction, and the rotating operation of the wiper during the thread hooking and thread cutting are basically the same as those described above. This is substantially the same as that described in Japanese Patent Application No. 7-150903.

Next, a control system of the lower thread automatic supply device will be described with reference to FIG. The take-up motor M1 is connected via a driver 24 to the output side of an I / O port 23 of a CPU (central processing unit) 22 which constitutes a control means. The solenoid valve 17 is connected via a driver 29, and the solenoid valve 17 is connected via a driver 29.

The output side of the I / O port 23 of the CPU 22 is also connected via the driver 39 to the threading / rotating motor 41 with a moving knife.

The output side of the I / O port 23 of the CPU 22 is further connected via a driver 26 to a drive source for causing the residual yarn removing device 1 to perform the above-described processing operation. A drive source for causing the exchange device 3 to perform the above-described processing operation is connected via the driver 27.

On the other hand, the input side of the I / O port 23 of the CPU 22 is connected to the thread supply detecting mechanism F for outputting the above-mentioned entanglement information and the lower thread winding amount information. An operation / display panel 28 for performing a predetermined input operation, displaying an error, and the like is connected.

Further, the CPU 22 has a ROM for storing the control operation procedure of the lower thread automatic feeding device in the form of a program.
30 is connected so as to be able to input, and a RAM 31 that stores data, operation results, and the like is connected so as to be able to input and output.

Next, the bobbin thread winding operation of the bobbin winding device 2 which is a feature of the present embodiment in the bobbin automatic feeding apparatus thus configured will be described in detail with reference to FIG. First, in the initial state, when the bobbin case holding means holding the bobbin case 6 is located at the lower thread winding position C, the bobbin case is moved to the position shown in FIG. 6 is waiting at a position P1 where the opening 6a is not closed (a retracted position; a position that does not hinder the entanglement of the lower thread).

Next, as shown in FIG. 7 (a), when the bobbin case gripping means gripping the bobbin case 6 is positioned at the bobbin winding position C by the bobbin exchanging device 3, the bobbin thread supply rotation motor M2 is driven. Then, the nozzle tip 16a from which the lower thread 14 having a length necessary for the entanglement is derived in advance is positioned at the initial working position N1 near the bobbin case opening 6a.

Next, the take-up motor M1 is driven, and the bobbin case gripping means is slightly advanced by the bobbin exchanging device 3 (moved toward the back side of the paper in FIG. The bobbin 13 is rotated by connecting to the existing hole.

Next, the electromagnetic valve 17 is opened and air from an air source is supplied through the yarn suction device 15 to the yarn supply nozzle 1.
To the bobbin case opening 6a by blowing the air from the nozzle tip 16a.
In addition, the lower thread guided inside the bobbin case is entangled with the bobbin shaft 13c by forming a vortex in the bobbin case by cooperation between the air and the bobbin rotation.

Next, as shown in FIG. 7B, the lower end of the nozzle 16 is moved from the initial working position N1 to the winding working position N2 so that the lower thread supply rotating motor M2 is driven to perform uniform winding. Go to

Particularly, in this embodiment, the yarn separating / rotating motor 41 with the moving knife is driven in accordance with this moving operation,
As shown in FIG. 7 (c), the thread handler 40 with the moving knife is rotated counterclockwise from the retreat position P1, and is positioned at the working position P2 as shown in FIG. 7 (d).

The working position P2 of the thread separating device 40 with a moving knife
The lower thread 14 between the bobbin case opening 6a and the nozzle tip 16a comes into contact (sliding contact) with the above-described lower thread guide notch 40a to supply the lower thread into the bobbin case 6. The path is bent, and the insertion angle of the bobbin thread 14 into the bobbin case 6 changes.

Here, the position P2 in the circumferential direction of the thread releaser 40 with a moving knife (more precisely, the notch 40a for the lower thread guide) for setting the insertion angle is set at the time of starting the lower thread winding immediately after the lower thread is entangled. As shown in FIG. 8, a straight line Y1 contacting the bobbin shaft 13c and connecting one bobbin case opening end 6b.
And a straight line Y2 that contacts the bobbin shaft 13c and connects the other end 6c of the bobbin case, and on the rotation locus R of the threading cutter 40 with a moving knife, the lower thread is entangled. Immediately afterward, the lower thread can be satisfactorily wound.

The circumferential position P2 of the above-described moving-knife-equipped yarn handling device 40 (more precisely, the notch portion 40a for the lower thread guide).
At the end of winding, as shown in FIG. 8, a straight line Y3 passing through one bobbin case opening end 6b and parallel to the straight line Y2, one bobbin case opening end 6b and the other bobbin case opening end 100% winding can be performed within the area surrounded by the straight line Y4 connecting the moving knife 6c and the rotation locus R of the thread separating unit 40 with a moving knife.

That is, in the present embodiment, the thread handling 40 with a moving knife (more precisely, the notch 40a for the lower thread guide)
Is set in the area surrounded by the straight lines Y2 and Y3 and on the rotation locus R of the thread separating device 40 with a moving knife, so that the bobbin thread winding immediately after the lower thread entanglement and 1
00% winding can be performed reliably.

The position P2 in the circumferential direction is defined by a straight line Y
2, within the area enclosed by Y3, thread handling with moving knife 4
It is more preferable to arrange at the center position on the zero rotation locus R. When the radius of the bobbin case 6 is r, it is preferable that the radial position of the thread handling unit 40 with a moving knife be within 2r from the center of the bobbin shaft 13c.
It is more preferable to be within the range of r to 1.6r.

When the 100% winding is performed in this way, the above-described thread hooking and thread cutting operations are performed, and FIG.
As shown in (e), in a state where the lower thread 14 required for the entanglement is drawn out from the nozzle tip 16a, a next lower thread winding command is waited, and the same operation is repeated thereafter.

As described above, in this embodiment, the insertion angle of the lower thread 14 supplied into the bobbin case is reduced by the lower thread guide notch 40a. Since the outer peripheral portion of 14 can be set at an angle that does not abut the bobbin case opening end 6b, 100% winding can be performed.

Even if the nozzle tip 16a is not in the region J (see FIG. 9) described in the prior art, the insertion of the lower thread 14 supplied into the bobbin case is performed by the lower thread guide notch 40a. Since the angle can be set to an insertion angle at which 100% winding can be performed, the winding operation position N2 of the nozzle tip 16a can be set.
You can also reduce the restrictions.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention. Needless to say, for example, in the above embodiment, the notch 4
The lower thread guide 40 having only the notch 40a for the lower thread guide and the lower thread guide moving means for moving the lower thread guide to the retreat position P1 and the working position P2 by providing 0a in the thread separating unit 40 with a moving knife. The lower thread guide and the lower thread guide moving means are separately provided, and the above-described thread separating with moving knife 40 and the thread separating and rotating motor 41 with moving knife are provided separately. The same operation as described above may be performed.

In the above-described embodiment, the insertion angle of the lower thread 14 supplied into the bobbin case is adjusted by the lower thread guide notch 40a so that the outer circumference of the lower thread 14 wound in the bobbin case is adjusted. The lower thread supply path moving means moves the entire lower thread supply means G while eliminating the lower thread guide notch 40a, although the portion can be set at an angle that does not abut the bobbin case opening end 6b. The lower thread supply path moving means moves the nozzle tip 16a in accordance with the winding (winding amount) of the lower thread 14 during the winding operation.
Is moved in a direction in which the outer peripheral portion of the bobbin thread 14 wound in the bobbin case does not contact the bobbin case opening end 6b, that is, the nozzle tip 16a is changed from the straight line Y1 shown in FIG. It is needless to say that the same effect as in the above-described embodiment can be obtained even if it is configured to move gradually or step by step.

[0053]

As described above, in the bobbin thread winding device according to the first aspect, during the winding operation, the bobbin thread guide abuts on the supplied bobbin thread between the tip of the bobbin supplying means and the bobbin case. Let
The bobbin thread supply path is bent by the bobbin thread guide, and the insertion angle of the bobbin thread supplied into the bobbin case is adjusted so that the outer peripheral portion of the bobbin thread wound in the bobbin case is at the bobbin case opening end. To the end of the bobbin case even if the winding operation position at the tip of the lower thread supply means is not in the above-mentioned area or not. Since it is configured to be able to be wound uniformly, the restriction of the winding work position at the tip of the lower thread supply means can be reduced, the degree of freedom in design can be improved, and the wound yarn overflows from the bobbin case opening. It is possible to perform 100% winding without any need, and it is possible to improve sewing efficiency.

According to a second aspect of the present invention, there is provided the lower thread winding device according to the first aspect, wherein the lower thread guide moving means moves the lower thread guide into contact with the supplied lower thread and a retracted position separated from the operation position. And the lower thread guide is configured so as not to be in the way, so that the above-described effects can be further enhanced.

According to a third aspect of the present invention, in the bobbin case, the lower end of the lower thread supply means is moved in the bobbin case by the lower thread supply path moving means in accordance with the winding of the lower thread during the winding operation. Even if the outer peripheral portion of the wound lower thread moves in a direction that does not abut the end of the bobbin case opening, the winding operation position of the tip of the lower thread supply means may or may not be in the above-described region. Since the wound yarn is configured to be uniformly wound to the end without abutting the end of the bobbin case opening, the restriction of the winding operation position at the tip of the lower yarn supplying means can be reduced, and the degree of freedom of design can be reduced. And the winding yarn can be wound 100% without overflowing from the bobbin case opening, and the sewing efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an automatic lower thread supply device employing a lower thread winding device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the upper and lower yarn winding device.

FIG. 3 is a front view showing the upper and lower thread winding device.

FIG. 4 is a plan view showing a lower thread guide employed in the upper and lower thread winding device.

FIG. 5 is a front view showing the upper and lower thread guides.

FIG. 6 is a block diagram showing a configuration of the entire apparatus according to the embodiment.

FIG. 7 is a state explanatory view showing the operation of the upper and lower thread winding device.

FIG. 8 is an explanatory view showing an arrangement position of the upper and lower thread guides.

FIG. 9 is an explanatory view showing a main part of a lower thread winding device according to a conventional technique.

[Explanation of symbols]

 Reference Signs List 6 bobbin case 6a bobbin case opening end 6b bobbin case opening end 13 bobbin 14 bobbin thread 16a tip of bobbin thread supplying means 40 bobbin thread guide (thread handling with moving knife) 40a bobbin thread notch 41 bobbin thread guide moving means E bobbin rotating means G bobbin thread supplying means M2 bobbin thread supplying and moving means N1 initial work position N2 winding work position P1 retreat position P2 work position

Claims (3)

[Claims] 1. A lower thread supply means which derives a lower thread from a lower thread supply source from a tip thereof and supplies the lower thread to a bobbin in a bobbin case, and a lower thread which derives a tip of the lower thread supply means from the tip. Bobbin thread supply moving means movable between an initial working position near the bobbin case opening to be inserted into the bobbin case from the opening of the bobbin case, and a winding work position separated from the initial working position to perform bobbin winding A bobbin rotating means for rotating a bobbin in the bobbin case during a winding operation in which the tip of the lower thread supply means is located at a winding operation position; and a tip of the lower thread supply means during the winding operation. The bobbin case is bent by abutting the supply path of the lower thread by contacting the supply lower thread between the bobbin case and the lower thread wound in the bobbin case. Bobbin And a lower thread guide set at an angle that does not abut the end of the case opening. 2. A bobbin thread guide moving means for moving a bobbin thread guide between a work position at which the bobbin guide comes into contact with the supplied bobbin thread and a retracted position separated from the work position. The bobbin winding device according to claim 1. 3. A lower thread supply means capable of leading a lower thread from a lower thread supply source from a tip thereof and supplying the lower thread to a bobbin in a bobbin case, and a lower thread leading a tip of the lower thread supply means from the tip. Bobbin thread supply moving means movable between an initial working position near the bobbin case opening to be inserted into the bobbin case from the opening of the bobbin case, and a winding work position separated from the initial working position to perform bobbin winding A bobbin rotating means for rotating a bobbin in the bobbin case during a winding operation in which a tip of the lower thread supply means is located at a winding operation position; and A lower thread supply path moving means that enables the tip of the lower thread supply means to move in a direction in which an outer peripheral portion of the lower thread wound in the bobbin case does not contact the end of the bobbin case opening; A bobbin winding device provided.